This 14-inch (35 cm), three-pin (female-female) 22-gauge extension cable is used for connecting the Prop-1, Prop-2, Prop-SX (or other device with 3-pins) to other suitable 3-pin devices, like PIR sensors or EFX-Tek expansion boards. The wire colour changes, so this item may not be exactly as shown. It's like a rainbow of random!